Autotrend EFI out of Diamond Springs, California, specializes in EFI conversions, EFI system design, wire harness design, and EFI calibration, which means that they’ve had plenty of experience dealing with routing ignition wires so they don’t interact negatively with the operation of other electrical components, such as ECMs. That work has resulted in the ignition wire looms seen here on this fuel-injected ZL1 Ramjet big-block. These billet aluminum wire looms are an alternative to cheaper plastic ones, and are designed to mount off of the lower valve cover bolts, so they can be used with any valve cover with enough lower bolts. Autotrend says they work very well with big-block Chevys and many Ford applications. They’re available in 1-, 2-, 3-, and 4-hole configurations, and can be purchased for $16.95 each (that’s about $136 for the setup you see here). For more information about Autotrend EFI and the products and services they offer, call 530-642-0999, or log on to www.autotrendefi.com